PASSAGE 1756)Organelles are tiny structures that perform very specific functions within cells. The term is a reference to organs, likening the way these structures operate in cells to the way organs function in the body. A number of different organelles can be found inside various types of plant, animal, and bacteria cells. Each has its own important task, such as producing energy or manufacturing proteins.These structures have a wide range of functions, most of which are tasks that are critical to the life of the cell. The most important structures are the nucleus, the endoplasmic reticulum (ER), the Golgi apparatus, mitochondria, and chloroplasts. Each of these tends to be located in specific areas of cells. Typically, the nucleus is located near the center, with the ER and Golgi located nearby, and the remaining organelles spread within the cell.The type and number of organelles present within a cell varies, depending on the cells purpose. For example, almost all plant and animal cells contain a nucleus, with the notable exception of mature red blood cells, which do not contain any organelles or genetic material. Another example is that muscle cells typically have many more mitochondria than other cell types, because more energy is required to keep muscle cells working effectively.
Posted on: Mon, 07 Jul 2014 23:44:09 +0000
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